Radio loud speaker cabinet



06L 24, 1933. w HOLLAND 1,932,343

RADIO LOUD SPEAKER CABINET Filed May 4, 1932 Patented Oct. 24, 1933 UNITED STATES PATENT OFFICE RADIO LOUD SPEAKER CABINET Application May 4, 1932. Serial No. 609,327

4 Claims.

This invention relates tosound reproducing apparatus and more particularly to radio loud speaker apparatus. The general object of the invention is to provide apparatus of this character which is designed to give more faithful reproduction of sound and more pleasing tone quality than has heretofore been obtained in known devices.

Briefly stated, the invention consists in so mounting a pair of sound reproducer units in a cabinet or housing that they propagate sound waves in directions substantially at right angles to each other, one direction being generally horizontal or slightly inclined upward, while the other direction is generally vertical.

The invention will be more specifically described with reference to the accompanying drawing, in which Fig. 1 is a sectional elevation of a device forming one embodiment of the invention;

Figs. 2 to 4-are similar illustrations of modified forms of the invention; and

Fig. 5 is a fragmentary sectional view taken along line 55 of Fig. 1.

Referring to Fig. 1, there is illustrated a radio receiver cabinet 1 of conventional form having a front panel 2 and a bottom panel or base 3. The cabinet is provided with a supporting base 4 which serves to support the radio receiver apparatus designated generally by numeral 5. The front panel has a sound emission opening at 6 which is covered by suitable grille cloth 7, and a sound reproducer unit 8 is mounted on the panel so as to propagate sound waves through opening 6, this being the customary arrangement in modern receivers. The panel serves as a bafile board for the unit.

In accordance with the preferred form of the present invention, a second sound reproducer unit 9 is mounted upon the bottom 3 of the cabinet in such manner as to propagate sound waves through an opening 10 provided in the said bottom, the bottom serving as a battle board. A cloth dust shield 11 may be provided. Preferably, the two sound reproducer units are of the electrodynamic type, but the invention is not thus limited, any known type of reproducer being contemplated. Moreover, the circuit arrangement of the reproducer units with respect to each other and with respect to the radio receiver may take any desired form. For example, the reproducer units may be connected in series across the output terminals of the radio receiver or the units may be connected in parallel across the output. They may be similarly designed to reproduce all frequencies with the same fidelity, or they may be designed differently so that each reproduces a particular band or bands of frequencies throughout the audible range. In the event that the units are to reproduce particular frequency bands, 0 any suitable design of the electrical circuit utilizing filter devices may be used.

I have found that by using two reproducer units positioned in the cabinet, as illustrated in Fig. 1,

a marked improvement in reproduction and tone quality is had. This results from the positioning of the units alone although, of course, the results obtained may be further enhanced by design of the units themselves and of the circuit in particular instances. Due to the arrangement of the '0 reproducers, reproducer 8 emphasizes the high frequency notes which, as is well known, travel more or less in straight lines and are not so readily reflected, while reproducer 9 diffuses and emphasizes the low frequency notes. had because the sound is propagated directly from reproducer 8 to a listener, while the sound from reproducer 9 is propagated indirectly by reflection and diffusion. Furthermore, the time lag introduced in the propagation of sound from 0 reproducer 9 due to the reflection of such sound, gives the reverberation efiect of a large room. The blending of sound from the two sources gives faithful reproduction and pleasing quality.

Fig. 2 discloses a modification of the invention 5 in which the positions of the sound reproducing units are varied, but the principle involved remains the same. In this embodiment, cabinet 1 is provided with inclined panels 12 and 13 having openings 14 and 15 therein which serve to support reproducer units 8a and 9a, respectively, the supporting panels serving as bafile boards for the units. It will be observed that the panels are substantially at right angles to each other, so that the directions of propagation of 5 sound waves from the two units are substantially at right angles to each other. The front panel 2 and base 3 of the cabinet are open at 16, 1'7 and 18. In this instance, the sound waves propagated by units 8a are directed slightly upward from the horizontal, while those from unit 9a are directed downward at an angle from the vertical. Results which are similar to those obiainable by means of the arrangement of Fig. 1 are also obtained in the apparatus of Fig. 2. In this instance also, the design of the units and the arrangement of the circuit may be, varied at will.

In the embodiment of Fig. 3, the reproducer unit 8b is mounted similarly to unit 8 of Fig. 1, 1 0

This effect is 15 while reproducer unit 9b is mounted similarly to unit 9a of Fig. 2. This arrangement also'gives the desired results above set forth.

In the device oi Fig. 4, unit 80 is mounted similarly to units 8 and 8b, while unit 90 is mounted on the top of the cabinet so as to direct sound upward, the cabinet top being open at 19. In this instance, the notes of the middle and low frequency range from unit 90 are disseminated by virtue of ceiling reflection as well as side wall reflection and ordinary diffusion.

In each of the above described embodiments, the reproducer units preferably have their axes in the same vertical plane. This disposition of the units of Fig. 1 is shown more clearly in Fig. 5.

While there are disclosed herein several embodiments of the invention, such other changes or modifications as would occur to persons skilled in the art are deemed to be within the scope of the invention.

I claim:

1. Sound reproducer apparatus, comprising a cabinet, a sound reproducer unit mounted in said cabinet so as to propagate sound waves into the outside atmosphere in a direction generally horizontal, and a second sound reproducer unit waves into the outside atmosphere in a direction generally vertical.

2. Sound reproducer apparatus, comprising a cabinet, a sound reproducer unit mounted in said cabinet so as to propagate sound waves into the outside atmosphere in a direction generally forward, and a second sound reproducer unit mounted in said cabinet so as to propagate sound waves into the outside atmosphere in a direction generally vertical.

3. Sound reproducer apparatus, comprising a cabinet, and a plurality of sound reproducer units mounted in said cabinet, all of said units having their axes in the same vertical plane but in non-parallel relation to each other, each of said units being positioned to propagate sound waves into the outside atmosphere.

4. Sound reproducer apparatus, comprising a cabinet, and a plurality of sound reproducer units mounted in said cabinet, all of said units having their axes in the same vertical plane but substantially at right angles to each other, each of said units being positioned to propagate sound waves into the outside atmosphere.

WALTER E. HOLLAND. 

